Sonoff Gateway USB 3.0 Dongle Plus not working with new Ikea Matter devices

Configuration Matter/Thread
1

Hi I have bought 3 x Kajplats Ikeas new matter bulb, but it won’t connect to my Zigbee gateway.

Am using this in Zigbee2MQTT

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2

Can you switch the Kajplats to Zigbee ? Thread devices don’t work with Zigbee2mqtt.

3

I don’t know where to do that, but I got them added to Zigbee2MQTT but it gives a N/A and Automatically generated definition. I can control lights though but not ideal.